HELP - I think I was just Hacked!

Oh my god, the absolute scariest thing just happened to me...

I was working on my server (logged in as a regular user), and I went to su, and got the message "who are you?", instead of the usual password prompt. I typed "whoami" and got "10000" - an ID, NOT my login name (which I would normally get).

I logged out, couldn't log back in... I went to webmin and noticed that usernames had been deleted... my username, the mysql username (and I don't know what else, yet). I had to recreate them. The root password had been reset to blank (and the port moved from a custom port back to 22)..

I am absolutely freaked out - I'm using 6.3-RELEASE-p1 (the latest) and I don't know what happened... It all happened right there while I was working on the server (and no - I'm 100% sure that I didn't accidentally do something stupid myself). I've changed the root password and username password, but this isn't going to solve how the person got in (assuming it was more sophisticated than a password guess).

Any ideas... has anyone ever heard of something like this before? Quick typing so I'm sure there's typos, sorry.

.

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